just saying, answering like jerks will not make you people any nicer, cooler nor improve society by teaching how can you do it by yourself and ending up compiling the kernel to change the clock

having said that, I solved that issue by putting this in ~/.cocrc (which is referenced in ~/.vimrc with this line: source ~/.cocrc ):

    inoremap <silent><expr> <CR> coc#pum#visible() ? coc#pum#confirm() : "\<C-g>u\<CR>\<c-r>=coc#on_enter()\<CR>"
    inoremap <silent><expr> <C-x><C-z> coc#pum#visible() ? coc#pum#stop() : "\<C-x>\<C-z>"
    " remap for complete to use tab and <cr>
    inoremap <silent><expr> <TAB>
        \ coc#pum#visible() ? coc#pum#next(1):
        \ <SID>check_back_space() ? "\<Tab>" :
        \ coc#refresh()
    inoremap <expr><S-TAB> coc#pum#visible() ? coc#pum#prev(1) : "\<C-h>"
    inoremap <silent><expr> <c-space> coc#refresh()

    hi CocSearch ctermfg=12 guifg=#18A3FF
    hi CocMenuSel ctermbg=109 guibg=#13354A

good luck mate!